There is disclosed an open showcase provided with a light device capable of simplifying a maintenance operation and improving a cooling efficiency in a display chamber. In an open showcase 1 of the present invention, a display chamber 11 is formed in an insulating wall 2, cold air is discharged from cold air discharge ports 16, 17 provided in an upper edge of a front surface opening 12 of the display chamber 11, and sucked into cold air suction ports 18, 19 provided in a lower edge of the opening 12, to form a cold air curtain in the front surface opening 12 of the display chamber 11, the open showcase includes a hand rail main body 24 provided on an upper end of a front wall 2C of the insulating wall 2 positioned outside the cold air suction ports 18, 19, a reflective plate 26 provided on the hand rail main body 24, and LED lights 40 attached to the reflective plate 26, and the inside of the display chamber 11 is illuminated with light emitted from the LED lights 40.